Porsche has used ceramic coating in their turbo cars for years. NOT, mind you, in or on the Exhaust Manifold. Given that they saw the importance of ceramic coating in production turbo cars, and chose exactly not to use it in the EM, one has to wonder, "why not"? Scott Justusson QSHIPQ@aol.com '87 5ktqwRS2 '86 5ktqw '84 Urq